Drill-chuck.



. Fig.1 showing certain parts broken away at the "adapted to firmly grasp or interlock with "dispensingwit'h the necessity of providing turs of construction illustrated in the draw- Fig. 4 is a sectional view taken on line 4 of away to provide a transverse groove\. 8

GEORGE R. RICH, OF CHICAGO, ILLINOIS,

ASSIGNOR TO THE WHITMAN & BARXES IVIANUFAIURIXG COMPANY, OF AKRON, OHIO, A CORPORATION OF OHIO.

DBILL-CI-IUCK.

No. 873,0 1 6. Specificaton of Letters Patent. Patented J 8.11. 7, 1908.

pplication filed April 22. 1007, Serial No. 369.618.

T 0 all whom' it ma-y co-ncern:

Be it known that I, GEORG-E R. RICH, a citizen of the United States, residing at Chicago, in the county of Cook and State of IIIIIIOS, have invented certain new and usef ul Im rovements in Drill-Chucks, of which the fol owing is a specification.

My invention relates to improvements in drill chucks, and its object is to provide an economical, -eflicient and simple device the spirals of drills, hav1ng capacity for redy ad'ustment, mcreased strength, accuraoy of feaming out holes in the metal. 4

-The mvention contemplates obtainin a look gr 1p upon the spira s themselves, tI1us the dri1lwith a 'shank or s eoial gri ping srfa;oe and making it possi le to mi out all of it is ultimately available for cutting pur os sq e inventionis adapted fo use With difierent sizes of drills having approximately similar mill gages.

It further consists in certainnovel feain and described in the specification.

l the drawings, I have shown a drill oliuck and twist drill embodying my invention in a preferred form. Figure 1 is a side elevtion'; 2 is a view taken on line 2 of end of the chuck to reveal the means of attachthe jaws and locking and unlocking them, and the end thrust stop bar adjustment; Fig. 3is a section taken on line 3 of Fig. 1;

Fig. 2; Fig. 5 is a seotional view through the jaws illustrating the similarly curved inner surfaces or faces of the jaws; and Fig. 6 is a view in perspective of my preferred form of adjustable stop bar. 4 i

A indicates the hollow chuc ody with an interim boro lar e enough to receive a drill. One end f t e body A isprovided avith exter'nal screw thread surface 7, out

which is undercut at its upper end at 9. Two jaws B, B, hereinaftenmore particola.rly describe'd, each havin an upw'ard projection 10 with lugs 11 on 1; e top outer corners to engage. the undercut port1ons 9, fit

ho (l upon the drill and speed in cutting or:-

into the groove 8 where they bang in the ohuck body, While the outer surfaces of each are made come shaped taper ing from to to bottoni. A cap C, interiorly threade to intermesh with the threads 7, is adapted to f t over the j aws, screw onto the chuok body and engage the cono surface indicated by 12 so as to force the jaws together upon the drill. The arrangernent is such that when the ca is screwed in one direction the jaws are un ocked and rnay be forced apart, the

iugs 11 sliding in grooves S, thus pern1itting' the drill to be removed, and when screwed in the other direction Will look the drill in position. This construction aiso ermits en-' tiro removal of the cap C from t e bod A and withdrawal of the jaws from the ugs when it is desirable to take the device apart.

In order to li1nit the distance which the drill may be thrust into the bore of the bod \f A, adjust the devioe so that the jaws grip it near the cutting end and to provide a suporting surfaoe for the end thrust during t 1o outting o eartion, I provide a stop bar I) and out tirough opposite sides of the chuok body from the interim to the exterior any desired number of registering pairs of orrfiees 14, 15, so that the stop bar may be thrust across the interior boro of the ohuck body, through any one of these pairs. The side of this bar nearest the cutting end of the chuck is flatteried to provide the squ are im acting surfaces 16 against whia-l1 the flat en( of the drill rests. I prefer to provide in eaoh end of this bar guides or grrooves 17, the edges of Which when in position in any one of the pairs of openings 14,15, project slightly from the exterior surface of the chuok body A.

In order that the stop bar D may be held in place, I provide thecurved spring 18 adapted to tightly embraoo the outer surface of the chuck body A and to fit into the grooves 17. T bis spring is out aw,ay at ,19 to provide an opening so that when it is slipped around to bring opening 19 over one o ends 17 the stop bar D can be removed from one pairbf openings 14, 15, and thereafter placed in another pair of openings 14, 15, and the spring slipped over it. In this manner the position of the drill in the chuck is regulated, and it is given end thrust support.

One of the important features of my 1nvntion is particularly illustrated in Figs. 4 and 5, wh erein the similarly curved inner surthe , faces 2l,-2l, of the jaws B, B, arei snowh.

These curves are hmi out with reference. to the mill gage 20 of the spirals of tbe drill, and are adzipted to fit c]osely on posite sides of the spira-1, and when broug t togeher o gra'sn t firmly. Any of the standard: size drill may be used hav ing ap roximately the same mill gage, and it WH- be apparent that by pl o-viding'a set of jaws, eah naving a;diflerent curved inner surface, thai; drills having entirely.diflerent mifl gag'es may be used with my ch uok by substiuting one set of 1aws for another m aooordanco W1th the diflerent gages.

The 0 station 'of dovce is as followstfl The dril to be used is mserted in che chuok.

;surfa'ces 12, 12, of he jaws B,fB, drawngthm together and causing the simiary Curved in1ier surfaos 21, 21, 110 mesh into the spiral nil gage 20grad'ually lockng the driH I prefer to oonstruot my chuck in position. of steel.

I am aware that many modfications of th specific form o fch1ck I have shown Will Suggest -themselves to those skilled in the art,

are inserted in flhe and I do not' wish to be unde rstood as'lin'1itng myself to it, but

Vhat I oaim and desire to secure by Let to1s ?atent s:

1. In a d1ill chuok, a hollow ohuck body provided with oppositelydisposed registering openings from the interior to the exterior thereof, a sto bar adfzpted to be thrust across said hol ow interior through sai d registering penings, md having guide ways on its ends ami a spring ourved to 'em'brace the extefior of said ohuck body and adapted al ternately 430 ho slipped in ai;1d out of sad gude-wa'ys to look and uplook sid stop in place.

body provdec with oppositely disposed registering openings from the interior to the exterorthereof, a stop bar havng guides its end.s adapted to be thrust e'angthw1'se aoross sad holow interior andprojeot through said. regxstermg opemngs, and a. ourved spnn'g to embraoe the -extemor of smd adaptec Z: In a drll chuck, a cylindricaohuok.

chuek. body and fit int o said gudes,- whereby said stop bar may be alternately locked and unlocked.

In testmony whereof I hereunto" affix my s1gnature' m presence off two vv 1tnesses.

GEORGE R. RICH.

Wtnesses: CHARLES L. HINE,

;RTHUR GREENE, 

